JPS624836A - Floating and supporting device for belt-like material - Google Patents

Abstract

PURPOSE:To automatically correct the deviation in the transverse direction of a traveling belt-like material to be floated and supported by alternately disposing floaters at both edges of the belt-like material so as to face the upper and lower sides thereof and bringing the fluid ejected from the floaters into collision against the belt-like material. CONSTITUTION:The fluid is ejected from the floaters 11a-11d to the surface of the strip 1 traveling in the arrow direction so as to collide against the strip and to generate a static pressure, thereby floating and supporting the above- mentioned strip 1. A pair of the floaters 11a, 11b are disposed to the lower side of the edge 1a on one transverse side of the strip 1 and to the upper side of the edge 1b on the other side so as to be symmetrical with the center of the strip 1 in the above-mentioned device. A pair of the floaters 11c, 11d are further juxtaposed in the reverse disposition adjacently to the traveling direction of the strip 1. The supporting forces toward the directions opposite from each other are acted on the strip by two pairs of such combinations, by which the transverse deviation of the strip is automatically corrected and the strip is automatically centered.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a device for floating and supporting a moving strip material, and is used, for example, when supporting a steel plate strip or the like in a non-contact manner during threading. be.

<Prior Art> As shown in Fig. 4, a strip 1 of a cold rolled steel plate is shown, which represents the concept of a continuous annealing furnace that has been used in the past as a processing equipment for metal strips such as cold rolled steel plate strips. It is fed out from a payoff reel (not shown), passes through a cleaning tank, looper, etc. (not shown), and is supplied to a continuous annealing furnace.

A large number of helper rolls 2 are provided above and below in this continuous annealing furnace, and the strip 1 is wound around these helper rolls 2 and moves up and down inside the furnace to adjust the required mechanical properties according to the mechanical properties required for the product. By being heated or cooled, it is imparted with mechanical properties such as yield strength, tensile strength, and good deep drawability at room temperature. In addition, in the continuous annealing furnace, strip 1
It is filled with reducing gas such as hydrogen nitride gas to prevent surface oxidation.

Strip 1 is typically 650-900 in heating zone A.
It is heated by the radiant tube 3 to about ℃. After that, it is heated uniformly for several tens of seconds in a soaking zone B, and then cooled to 400 degrees Celsius at a cooling rate of 3 to 200 degrees per second by a gas jet in a rapid cooling zone C.
It is quenched to about 0.degree. C., then subjected to an overaging treatment at about 400.degree. C. for about 2 minutes in an overaging zone, and finally quenched to room temperature by a gas jet in a final quenching zone E.

By the way, in a continuous annealing furnace like Otsu, the overaging zone requires a long residence time of about 2 minutes, so in a large continuous annealing furnace, the furnace length in the overaging zone is shortened by about 100 meters. The continuous annealing furnace as a whole is very long, over 150 meters. If this overaging zone can be shortened, it is expected that a continuous annealing furnace can be manufactured in a shorter length and the construction cost of the equipment can be reduced. As a specific means for this, it has been found that the length of the overaging zone can be shortened by changing the material of the strip 1 and increasing its heating temperature higher than before.

However, when realizing such a furnace, if a high temperature strip is brought into contact with the roll, the strength of the strip is reduced, resulting in uneven contact with the cold roll or the roll surface with carbon, etc. attached in the rolling oil. Thermal deformation of the strip due to contact with the strip becomes a problem in threading.

In addition, if the strip is run vertically as in the past, the high temperature will cause a creep phenomenon due to the strip's own weight, resulting in a narrowing of the width. It is necessary to run stably without causing any problems.

In this way, floaters that support strips in a non-contact manner have been developed in order to pass the strips horizontally across long distances without causing them to sag. has been done.

Figure 5 shows the concept of a floater installed in a continuous annealing furnace.
As shown in FIG. 6, which shows a cross section in the direction of the ■-■ arrows, and FIG. 7, which shows the cross-sectional structure of the floater, a plurality of floaters 11 are provided directly under the running strip 1, and these floaters 11 They are arranged along the plate direction (right side in FIG. 5). Each floater 11 has narrow slit nozzles 12 at both front and rear ends of the strip 1 in the threading direction, and these slit nozzles extend in the width direction of the strip 1 and extend diagonally upward to opposite sides. It's open. Therefore, the gases such as hydrogen nitride ejected from these slit nozzles 12 collide with each other and their flow direction is suddenly changed, and due to the change in momentum, the static pressure of the gas pressure is increased between the strip 1 and the pressure receiving surface 13 on the upper surface of the floater 11. , and levitates and supports the strip 1.

Note that the type of ejected gas is generally the same type as the atmospheric gas in the furnace. Further, in the figure, 14 is a plurality of radiant tubes provided above and below the strip 1 for heating the strip 1, 15 is a radiant tube burner or a recuperator for preheating the intake air for combustion of the radiant tube, 16 is a support for the radiant tube 14, 17 is a duct for supplying gas to the floater 11, and 18 is a furnace wall of the continuous annealing furnace.

<Problems to be Solved by the Invention> The floater 11 described above generates uniform static pressure between the strip 1 and the pressure receiving surface 13 and supports the strip 1 in a floating manner. If the position of the strip 1 shifts in the width direction, there is no function to correct this. For this reason, there was a risk that an unexpected accident would occur in which the strip 1 came into contact with the furnace wall during sheet passing.

Incidentally, the above-mentioned problems occur not only in continuous annealing lines, but also in continuous plating lines, and not only in strips but also in floating supports in continuous running lines for other materials (paper, etc.).

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a floating support device having a function of automatically correcting the deviation in the width direction of a strip material supported in a floating manner by a floater, that is, an automatic centering function. purpose.

Means for Solving the Problems> The structure of the present invention that achieves the above object is to provide a device for floating and supporting a traveling strip by colliding fluid ejected from a floater with the surface of the traveling strip. One of the floaters is provided below one edge portion in the width direction of the strip material, and the other is provided above the other edge portion, and these pair of floaters and the floater are adjacent to each other in the running direction of the strip material and opposite to each other. It is characterized by a pair of floaters arranged side by side.

In the strip material flotation support device with the above configuration, when the strip material shifts in the width direction, the force acting on the strip material in the direction of the center of the strip material line is no longer exerted by the fluid ejected from the front and rear floaters on the displaced side. This becomes greater than the force received from the front and rear floaters on one side, and the strip material is automatically returned to the center side.

Embodiment> Figs. 1 to 3 show an embodiment in which the present invention is applied to floating support for a strip. b) that A-A, B
-B arrow sectional view, FIG. 3 is an explanatory representation of the centering function.

In the running line of the strip 1, a floater lla is provided below the edge portion 1a on the right side (referred to as the left side) in the width direction of the strip 1, with its fluid spout 21 facing upward. A floater Ilb is provided above the edge portion 1b on the other side (right side) of the strip 1, with the fluid jet port 21 facing downward. These pair of floaters 11a.

11b and the pair of floaters 11a at a position adjacent to the front side of the strip 1 in the running direction.

Another pair of floaters 11c and li are arranged in the opposite direction to 11b.
d is provided. In other words, the floater llc is provided above the left edge portion 1a with the fluid jet port 21 facing downward, and the floater 11d is provided below the right edge portion 1b with the fluid jet port 21 facing upward. . These left and right pairs of floaters 11a, llb, llc
and lid are symmetrical with respect to the center O of the running line of the strip 1. Further, these floaters lla to d are designed so that the supporting force of the ejected fluid acts only on a portion of the edge portion 1a or 1b of the strip 1.

The floaters lla to d may have any structure as long as they eject fluid, but here, as an example, a structure similar to that shown in FIG. 7 is adopted.

In the floating support device having the above configuration, the upstream rotor la
, lb, as shown in FIG. Since the edge portion 1b is applied from above, the strip 1 receives a force that tries to rotate it clockwise as shown by the broken line in the figure.On the other hand, these pair of floaters la and lb and the adjacent floater l
c.

In 1d, the arrangement is reversed, so Fig. 2 (
As shown in bl, the supporting force by the floaters lc and ld acts to rotate the strip 1 counterclockwise.

FIG. 2(a) (As shown in bl, the strip 1 is attached to the left and right floaters la.

When the strip 1 is located at the center between 1c, lb, and ld, the magnitude of the force applied to the strip 1 by the supporting force of each floater 1a to 1d is the same, and the width direction component F due to the tilting of the strip 1 ,, F2. F, , F3 are all the same size, strip 1 is balanced both in the width direction and in the vertical direction, and strip 1 is located at the center of the line and does not rotate.

However, if the strip 1 shifts to the left as shown in FIG. 3, for example, the supporting force received by the left side of the strip 1 increases, and its widthwise components F, t, F3' become larger than the widthwise components on the right side. , the strip 1 will be subjected to a force that moves it back to the right. Even if the strip 1 shifts to the right, a force is similarly applied to return it to the left. Strip 1 is therefore automatically centered.

In the above embodiment, a floating support device is shown which consists of two pairs of front and rear floaters 1a to 1d, but depending on the length of the floating strip 1, a plurality of sets of floaters may be provided, with two pairs forming one set. .

Furthermore, the present invention is applicable not only to floating supports of strips but also to floating supports of other materials such as paper.

<Effects of the Invention> According to the floating support device according to the present invention, it is possible to travel and move the strip material while automatically centering it, thereby making it possible to prevent unexpected accidents caused by swinging of the strip material in the width direction. .

[Brief explanation of drawings]

Fig. 1 is a plan view of a floating support device according to an embodiment of the present invention, Fig. 21g (a) is a sectional view taken along the line A-A of Fig. B arrow sectional view, Figure 3 (al (
bl is an explanatory diagram of the operation of the floating support device, Fig. 4 is a conceptual diagram of a continuous annealing furnace, Fig. 5 is a conceptual diagram of a floater installed in a continuous annealing furnace, and Fig. 6 is a sectional view taken along the ■-■ arrows. FIG. 7 is a sectional view of the floater. In the drawing, 1 is a strip, 11a, llb, llc, and lid are 7 o-evens.

Claims (1)

[Claims] In a device in which fluid ejected from a floater impinges on the surface of a running strip material to float and support the strip material, one of the pair of floaters is provided below one edge in the width direction of the strip material. A flotation support device for a strip material, characterized in that a pair of floaters are arranged side by side with the other floater provided above the other edge part, adjacent to the pair of floaters in the traveling direction of the strip material, and in reverse arrangement. .